Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 8, Problem 25P
To determine
The effects of the three left-turn treatments at signalized intersections on saturation flow rate and geometric design.
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55 mph roadway with two northbound through lanes (both are 11 feet in width) through an intersection. Beyond the intersection, the lanes merge into one lane. Please calculate the merge taper AND the distance the sign must be place AHEAD or upstream of the beginning of the merge.
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A signalized intersection approach has an upgrade of 4%. The total width of the cross street is 60 ft. The avg. vehicle length is 16 ft. Traffic operates at 40 mph. Find the min. change and clearance interval (CCL).
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A local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight distance problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.
Chapter 8 Solutions
Traffic And Highway Engineering
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- A local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.arrow_forwardA minor 2-lane roadway with design speed of 45 mph crosses a major 2-lane roadway with design speed of 50 mph at 90 degree angle at an at-grade T-intersection. All lanes are 12 ft wide. If a stop sign is installed on the minor road, determine the dimensions ofallrequired clear sight triangles at this intersection for passenger cars(Case B, stop sign control on the minor road).arrow_forwardTwo adjacent signalized intersections along a major arterial are 650 ft apart (stop line to stop line distance). If the space mean speed between these two intersections is 22 mph, what should be the signal offset of the downstream intersection relative to the upstream intersection? Group of answer choices 20.0 sec 13.5 sec 40.0 sec 29.5 secarrow_forward
- Q3: A four-leg intersection with no traffic control is formed by two-lane roads with the speed limits on the minor and major roads being 15 and 25 mi/h, respectively. If the roads cross at 90° and a building is to be located at a distance of 45 ft from the centerline of the outside lane of the major road, determine the minimum distance at which the building should be located from the centerline of the nearest lane on the minor road so that adequate sight distances are provided.arrow_forwardFour-phases signal with a cycle time of 80 sec, Inter Green = 4 sec/phase, lost time / phase = 2 sec. Saturation flow on all approaches are similar, but the maximum traffic flows on two of the phases are triple the maximum traffic flows on the remaining two approaches, what will be actual green time on each phase ?arrow_forwardA signalized intersection approach has two lanes with no exclusive left- or right-turning lanes. The approach has a 50-second green out of a 90-second cycle. The yellow plus all-red intervals for the phase total 4.0 s. If the start-up lost time is 2.0 s/phase, the clearance lost time is 1.5 s/phase, and the saturation headway is 2.25 s/veh under prevailing conditions, what is thecapacity of the intersection approach.arrow_forward
- A developer has applied for a construction permit to build a supermarket at the southeast cornerof an intersection that is formed by a four-lane divided highway in the east-west direction and atwo-lane road in the north-south direction. Traffic on the two-lane road is controlled by a stop signat the intersection. The speed limit on the four-lane highway is 88 km/h. using the sight trianglerequirements at the intersection (Case B1), determine whether permission should be given for theconstruction if the following conditions exist. Provide a diagram for your solution.Major road lane width = 3.6 mMinor road lane width = 3.3 mMedian lane = 2.8 mDesign vehicle is a passenger carApproach grade = 2%Maximum feasible distance building from the center of the nearest lane of four-lane road = 5.4 mMaximum feasible distance building from the center of the nearest lane of two-lane road = 16.5 marrow_forwardA) In a signalized intersection with three legs, the north phase has two movements: left turn movement with the one-lane approach and through movement. Evaluate the saturation flow rate of each movement. If the environmental condition is bad, and the continuous uphill gradient is 1%. The approach width for the through movement is 24 ft. (assuming: no on-street parking, no bus stops. and negligent bicycle and pedestrian traffic conflicting). B) Briefly describe the factors that controlled a selection of a transportation project and the role of the highway engineers. Then explain how to translate the project's ability objectives to solve the problem into criteria. C) Two alternatives have been proposed to construct a new road project to improve capacity and safety. The table below explains each alternative's costs: the initial construction costs, annual operating and maintenance costs after the first year, and resurface of road costs. Assume that the annual interest rate is 5%. Determine…arrow_forwardProblem 4: Compute delays and determine LOS for the NBTH and NBLT lane groups at this intersection. Assume a full-actuated control with unit extension (passage time, PT) of 4 seconds and absence of filtering/metering at the neighboring signalized intersections. Effective green signal times are. 8 NB,TH = 33.2s =17.3s 8 NB,LT and Cycle length is: C = 125 s 3.41 3.99m 4.02m 7.99m- 3.81m 3.82m N X Street 1.38m 3.03m 5.73m 5.29m 3.48m 1.55m 3.26m 3.21m 3.47m 4.51m 6.70m 3.19m 1.20m 3.44m 3.90m 3.87m 4.06m 4,09m 4,51m Y Street Figure 1. Dual-Ring Phasing, X St. and y Street (North is up)arrow_forward
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